Lockyer, Norman, Sir, 1836-1920, Seabroke, G. M. (George Mitchell), 1848-1918 · London, Macmillan and co. · leaf 87
re the foci of each other s, s,Fig. 28, called conjugate foci; as one aj^uoaches thelens the other recedes, and vice versa, and it is obviousthat when the one approaches the lens so as to coincidewith the principal focus, the other recedes to an infinitedistance, and the emergent rays are parallel.… … Fk;. 29.— Conjugate linages. paper just on the other side of the lens, there will be asmall flame depicted on it, an exact representation of
Astronomy · Telescopes
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